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Since then, scientists have managed to be taught a bit more in regards to the mantle, the layer that lies beneath the Moho, which quantities to 83 percent of the Earth's quantity and 67 percent of its mass Encyclopaedia Britannica. To make issues tougher, as they drill deeper into the Earth, they're going to encounter extreme temperatures, probably in excess of 1,000 degrees Fahrenheit (538 degrees Celsius), and unbelievable amounts of pressure - as much as 4 million pounds per sq. foot in the vicinity of the mantle. In 1909, Andrija Mohorovičić, a Croatian researcher, discovered that about 20 miles…